Arun B.

If your header file and code file is in the same director use include "myheader.h". This is mostly used of you define your own custom header file. On the other hand, include followed by with anglular brackets greaterthan-> and less than -

When do you absolutely have to declare a class as abstract (as opposed to free-willed educated choice or decision based on UML diagram)?

I hope you are aware of what Abstract Class is . Lets say an Example. You are developing a Library that Detects User Interaction with the device and enable the developer to define their own response to the user. Let me Name it as an InputHandler Class. In this case, you are defining functions for each user interaction line key press, mouse click, etc i.e EventDetection. Now When you define the InputHandler class. You cannot declare the functions that will be called on the appropriate user interaction, But you cannot define it, because the response is different for different applications that use the library. In this case you can make the InputHandler abstract by declaring the EvnetDetecting functions virtual. Hope you understood ...

Compile Time Errors - Errors that were caught during compilation of the program are called as Compile Time Errors. Mostly Language Syntax Errors & Semantic Errors will be caught as Compile Time Errors. Run Time Errors - Errors that were caught during the execution of the program are called as Run Time Errors. Logical Errors like integer divided by Zero will be caught during this Run Time as this kind of error cant be caught during compile time.